Hands free orgasm while pumping and or using dildo

I was using my cock and ball tube one day, pumping up both at the same time obviously. I also was horny and used my dildo while I was pumping. I have done this before and usually it makes me precum lots, but this time I was only fucking my ass slowly, it felt sooo good and like I was dry orgasming or anal orgasm, then I blew a huge load in my tube without doing anything. Anyone else ever experience this ?

i've seen a video of a guy sitting with a soft cock, his cock gets hard without him touching it and then a few minutes later he just cums. he never touches his cock, he must have been watching some fucking great porn!!